Manufacture of silvered glass



y 1930. L. OFFENBACHER 7 1,770,991

MANUFACTURE OF SILVERED GLASS Filed April 28, 1928 Patented July 22,1930 UNITED STATES PATENT orrica L'UITPOLD OFFENBACHER, 0F FURTH,GERMANY, ASSIGNOR TO THE FIRM BAYERIBCHE SPIEGELGLAS-FABRIKENBECHIIANN-KUPFER Aa-G 0F FURTH, GERMANY MANUFACTURE or SILVERED crassApplication filed April 28, 1928, Serial No This invention relates to anapparatus for finishing silvered glass, which considerably simplifiesand shortens the methods hitherto em loyed.

ccording ,to the present invention the following devices .are positionedone behind the other along a conveying arrangement: a mechanicalflushing device for the silvered glass which flushes the entire breadthand both sides of the glass simultaneously, a drying device for theflushed glass, which operates with hot air under pressure, a mechanicalspraying device for applying the shellac to the dried glass, a seconddrying device for the coating of shellac, which also operates with hotair under pressure, a second mechanical spraying device for appl ing thecovering varnish and finally a thir drying device for the coating ofcovering varnish, also operating with hot air under pressure.

A constructional example of such an arrangement according to the presentinvention is illustrated, in which Fig. 1 shows the first half of theapparatus in side elevation,

Fig. 2 the second half of the apparatus in side elevation,

Fig. 3 the apparatus in cross-section on line A---A of Fig. 1 and Fig. 4the apparatus in cross-section on line BB of Fig. 1.

In a frame 2, 3 mounted on supports 1 there are j ournalled a pluralityof rotatable rollers 4, 5 and two drums 6 as carriers for an endlessconveyor belt 7. The rollers 4, 5 arecovered with rubber rings 10 and atone end of each roller is mounted outside the frame 2 a small toothedwheel 8, over which an endless chain 9 runs. On the conveyor belt lies aweb of thin paper 11 which travels with the blt and which unrolls from adrum 12 and winds up on a drum 13 (Fi 2). By

. 273,585, and in Germany August 11, 1925.

supply pipe 18' is .opened, jets of water are directed towards eachother between the rollers 4 (Fig. 3). Between the rollers 5 the nozzles19 of a hot air supply 20 are directed from above and below towards oneanother. The conveyor belt 7 is brid ed over at its front end by astirrup 21 (Fig. 4), to which a rocking arm 22 supporting a sprayingpistol 23 is suspended. From the spraying pistol 23 a flexible tube 24leads to a container 25 in which there is liquid shellac under pressure.

Behind the stirrup 21 a second group or nozzles 26 of a hot air supply27 is located above the conveyor band 7 and behind these nozzles 26 asecond spraying device 28 with a spraying pistol 29 is provided, theflexible tube 30 of which leads to a container 31, in which is liquidcovering varnish under pressure. This spraying device 28', 29 isfollowed by a further blast device and at the end of the conveyor deviceis a table 33 for receiving the finished article.

When the motor 15 is switched on the rollers 4, 5 rotate in thedirection of the arrow at and the upper stretch of the conveyor belt 7travels in the direction of the arrow 7). The web of paper 11 resting onthe conveyor belt travels in the same direction and at the same speed.The silvered and flushed pieces of glass are placed on the rollers 4 oron the rubblast of hot air is blown against them on either side. Afterpassing between the nozzles 19 the pieces of glass arrive in acompletely clean and dry state on the conveyor elt 7 and under thespraying device 23.

Thereupon the shellac. is applied mechanically to the piecesof glass bymeans of a spraying device 23 in contradistinction to the methodshitherto employed, in which the shellac is applied with a brush. Theshellac is sprayed in a thin layer on the glass by means of the sprayingpistol 23 by compressed air, the glass being at the same time conveyedalong by the conveyor belt. Behind the spraying device thepieces ofglass travel under a second hot a1r blast devlce 26, whlch causes theshellac to dry immediately. Consequently the pieces of glass can havethe covering varnish applied to them immedlately after the applicationof the shellac by means of the spraying device 29. Finally the pieces ofglass pass under a third hot air last device 32 by which the coveringvarnish is also dried. At the receiving table 33 the finished pieces ofglass'are removed as they arrive and are taken away to be further dealtwith.

As compared with the known methods, that described abo've'has theadvantage that within six minutes a piece of glass is silvered andcovered with varnish, i. e. completely finished, without having to betouched by hand during the whole operation. In many cases it will besufiicient to provide the ieces of glass with covering varnish only, ater they have been silvered. In this case the container 25 is not filledwith shellac but with covering varnish, the second spraying device 30 anthe blast device 32 being put out of operation.

What I claim is;

1. An apparatus for finishing silvered glass, comprising in combinationwith a continuous conveying device, a mechanical flushing device capa leof covering the whole breadth and the two sides of the glass, a dryingdevice using hot air under pressure for the flushed glass, amechanicalspraying device for applying shellac to the dried glass and asecond drying device using hot air under pressure for drying the coatinof shellac,.as and for the purpose set fort 2. An apparatus forfinishing silvered glass, comprising in combination with a continuousconveying device, a mechanical flushing device capable of covering thewhole breadth and the two sides of the glass, a drying device using hotair under pressure for the flushed glass, a .mechanical spra ing devicefor applying shellac to the drie glass, a I

second drying device using hot air under pressure for drying the coatingof shellac a second mechanical spraying device for applying the coveringvarnish and a third drying device using hot air under pressure fordrying the covering varnish, as and for the purpose set forth.

In testimony whereof I have signedmy name to this specification.

LUITPOLD OFFENBACHER.

